ar X iv : 1 60 6 . 07 97 6 v 1 [ m at h . A C ] 2 5 Ju n 20 16 TOTALLY ACYCLIC APPROXIMATIONS
نویسنده
چکیده
Let R be a commutative local ring. We study the subcategory of the homotopy category of R-complexes consisting of the totally acyclic Rcomplexes. In particular, in the context where Q → R is a surjective local ring homomorphism such that R has finite projective dimension over Q, we define an adjoint pair of functors between the homotopy category of totally acyclic R-complexes and that of Q-complexes, which are analogous to the classical adjoint pair between the module categories of R and Q. We give detailed proofs of the adjunction in terms of the unit and counit. As a consequence, one obtains a precise notion of approximations of totally acyclic R-complexes by totally acyclic Q-complexes.
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تاریخ انتشار 2016